hw/intc/openpic: Avoid taking address of out-of-bounds array index

The clang sanitizer complains about the code in the EOI handling
of openpic_cpu_write_internal():

UBSAN_OPTIONS=halt_on_error=1:abort_on_error=1 ./build/clang/qemu-system-ppc -M mac99,graphics=off -display none -kernel day15/invaders.elf
../../hw/intc/openpic.c:1034:16: runtime error: index -1 out of bounds for type 'IRQSource[264]' (aka 'struct IRQSource[264]')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../hw/intc/openpic.c:1034:16 in

This is because we do
  src = &opp->src[n_IRQ];
when n_IRQ may be -1.  This is in practice harmless because if n_IRQ
is -1 then we don't do anything with the src pointer, but it is
undefined behaviour. (This has been present since this device
was first added to QEMU.)

Rearrange the code so we only do the array index when n_IRQ is not -1.

Cc: qemu-stable@nongnu.org
Fixes: e9df014c0b ("Implement embedded IRQ controller for PowerPC 6xx/740 & 75")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-id: 20241105180205.3074071-1-peter.maydell@linaro.org
(cherry picked from commit 3bf7dcd47a3da0e86a9347ce5b2b5d5a1dcb5857)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/intc/openpic.c b/hw/intc/openpic.c
index 9792a112240bac3c5cddda80d0ab0438a6d1fa59..b35b1ee6f7b302e939da4d7ad7bd08c510fa73fd 100644 (file)
--- a/hw/intc/openpic.c
+++ b/hw/intc/openpic.c
@@ -1032,13 +1032,14 @@ static void openpic_cpu_write_internal(void *opaque, hwaddr addr,
         s_IRQ = IRQ_get_next(opp, &dst->servicing);
         /* Check queued interrupts. */
         n_IRQ = IRQ_get_next(opp, &dst->raised);
-        src = &opp->src[n_IRQ];
-        if (n_IRQ != -1 &&
-            (s_IRQ == -1 ||
-             IVPR_PRIORITY(src->ivpr) > dst->servicing.priority)) {
-            DPRINTF("Raise OpenPIC INT output cpu %d irq %d",
-                    idx, n_IRQ);
-            qemu_irq_raise(opp->dst[idx].irqs[OPENPIC_OUTPUT_INT]);
+        if (n_IRQ != -1) {
+            src = &opp->src[n_IRQ];
+            if (s_IRQ == -1 ||
+                IVPR_PRIORITY(src->ivpr) > dst->servicing.priority) {
+                DPRINTF("Raise OpenPIC INT output cpu %d irq %d",
+                        idx, n_IRQ);
+                qemu_irq_raise(opp->dst[idx].irqs[OPENPIC_OUTPUT_INT]);
+            }
         }
         break;
     default: